Machine for manufacturing tubular bodies from plastic substances



June 18, 1929. A. HANNS 1,717,507

MACHINE FOR MANUFACTURING TUBULAR BODIES FROM PLASTIC SUBSTANCES FiledJune 8, 1926 2 Sheets-Sheri. l

June 18, 1929. AHANN 1,717,507

MACHINE FOR MANUFACTURING TUBULAR BODIES FROM PLASTIC SUBSTANCES FiledJune 8, 1926 2 Sheets-Sheet 2 INVENTOR for inserting in these bodieswooden or other Patented June 18, 1929.

UNITED STATES 1,717,507 PATENT OFFICE.

ARTHUR HANNS, OF LEIPZIG-PLAGWITZ, GERMANY.

MACHINE FOR MANUFACTURING TUBULAR BODIES FROM PLASTIC SUBSTANCES.

Application filed June 8, 1926, Serial No. 114,550, and in Germany July3,1925.

My invention relates to machines for manufacturing tubular bodies suchas toy whistles and the like from plastic substances such as sugar orchocolate, means being provided handles. It is an object of my inventionto provide improved means for preparing such bodies for the reception ofsuch handles or the like. To this end I provide one or several mouldsand retractable cores adapted to cooperate with such moulds so as toform cavities in the hollow bodies.

In the drawings'aflixed to this specification and forming part thereof amachine embodying my invention is illustrated diagrammatically by way ofexample.

In the drawings,

Fig. 1 is a side elevation of the machine, and

Fig 2 is an end elevation,

Fig. 3 is a section on the line 33 in Fig. 1,

Fig. 4 is a plan view, and i Fig. 5 is an elevation of a core extractor.

Fig. 6 is a section on the line 6-6 in Fig. 3. Figs. 4 to 6 are drawn toa larger scale.

Fig.7 is an end elevation, partly in section on the line 7-7 of Fig. 8,and

Fig. 8 is an axial section of a modified mould cylinder.

Fig. 9 is a view in-section taken on line 9-9 of Fig. 1 and viewed inthe direction of the arrows.

Referring to the drawings, 1 and 2 are mould cylinders secured on shafts3 and 4, respectively, journaled in uprights a and b. Rotation isimparted to the shaft f the lower mould cylinder 2 by any suitable means(not shown) and is transmitted to the shaft 3 of the upper mouldcylinder 1 through the medium of gears 4 and 3'.

Cavities c and cl are formed in the cylinders 1 and 2 and during therotation of these cylinders the cavities in the cylinder willsuccessivelyregister in pairs. Grooves 11 extend from both ends of eachcavity 0 in the cylinder 1, and similar grooves 11 extend from the endsof the cavities d in the cylinder 2. As the cylinder 2 is longer at oneend than the cylinder 1, the grooves 11' are correspondingly longer atthat end. Discs 5 and 2 1 of somewhat larger diameter than the cylinder2 are seated on its shaft 4 at both ends of the cylinder and areprovided with perforations, for the reception of cores 6 and 26,respectively, which are adapted to reciprocate in the perforations underFig. 6, with the object of forming the air outlet of the whistle. Thisprojection extends as far as the core 6 and displaces the plasticsubstance at that point. Obviously the projections 27 might as-well beformed in the cavities d of the cylinder 2, or in both cavities, asdesired. The plastic substance, for instance a sugar solution issupplied by a chute 7 and a hopper 10 is arranged slightly in advance ofthe chute and charged with handles such as short wooden sticks for thewhistles. These handles it discharges into the longer grooves 11 ofthe-cylinder 2. A knurled roll 23 is carried by an arm 23 which isfreely journaled on the shaft- 3. This roll is arranged between the disc5 andthe cylinder 1 opposite the hopper, and retains any handles whichmight leave said hopper after the corresponding groove 11 has moved pastit.

A cam drum 16 with a groove 17 and apinion 16 are arranged in front ofthe upright a. Rotation is imparted to said pinion from the shaft 4through suitable gearing (not shown). A pin or roller 18 at the end of adoublearmed lever 15 is inserted in the groove 17 (Fig. 2). The lever 15is fulcrumed at 15 in a bracket 6 secured to the upright a and connectedwith a slide 14; through a link 14. A core extractor 12 and a push bar13 for the handles extend in parallel from said slide toward the disc 5of the cylinder 2.

The extractor 12 is shown on a larger scale in Figs. 4 and 5. Its end isprovided with a fork 19 comprising two teeth 20 and 21. When thecylinder 2 rotates, bosses 6 at the ends of the cores 6 enterbetweenthese teeth.

The operation of this machine is as follows:

The cylinders 1 and 2 rotate as indicated by the arrows in Figs. 2 and3, and the cores 6 and 26 penetrate gradually into the cavities d, asthey approach the gaps in the cams 8 and 25, and finally abut againsteach other as shown in Fig. 6, when a pair of cavities c and d are inregister Shortly before this occurs, the cavity 03 hasbeen charged withL I sugar solution from the chute 7, and, as at this time the cores havepenetrated a considerable distance into the cavity, they do not expelthe plastic substancebut, on the contrary, the plasticsubstance fillsthe space of the cavity which surrounds the cores. As shown in Fig. 6,the mould is completed by the 'two cavities 0 and d, the cores 6 and 26and the projection 27 which shapes the airhole in the Whistle. As therotation of the cylinder 2 continues, the bosses at the ends of thecores 6 and 26 glide off the corresponding cams and are forced into thegaps of thecams by their pull-back springs 8 and 28, respectively. Asregards the cores 26, the springs can be relied upon to retract thecores as these latter are buried in the plastic substance a shortdistance only and therefore, means for extracting the cores 26 are notprovided, but the function is not'so reliable for the cores 6,and-therefore the extractor 12 is now moved to the left ,in Fig. l bythe groove 17 and the lever 15 and positively extracts the core 6 fromthe mould. As soon as the corresponding groove 11 has been laid open bythe re tracted core 6, it is entered by one of the handles from thehopper 10, this handle, on continued rotation of the cylinder 2, beingpressed into the groove bythe knurled roller 23: Meanwhile the core 6which was just extracted will have cleared the extractor 12 and will beengaged by the push bar 13, so that when the slide 14 is again advancedto the right by the groove 17 the'core will be advanced pushing thehandle into the cavity formed by the core 6. Atthe same time theextractor 12 will engage the core 6 of the succeeding mould. Some playmust be provided so as to enable the pusher and the extractor to performtheir functions while the cylinders 1 and 2 are rotating. The finishedwhistle is now free and as the mold cylinder revolves itidrops out ofthe machine.

this end, the heads of the cores 26 are cut away on their outer edges at31 and an angular flange 29 is formed on the cylinder 24 against whichsuch cut-away or flattened edges 31 abut and hold the cores againstrotation. Obviously, instead of being circular, as shown, th head ofthecores 26 may be of any suita e shape and the edges 31 may be straight orcurved, as convenient;

Obviously, it is also possible to manufacture articles of the kinddescribed without handles or other insertions, and the mechanism forextracting the cores 6 may be eliminated without departing. from thespirit of my invention, and I Wish it to be understood that I do notdesire to be limited to the exact details of construction shown anddescribed for obvious modifications will occur to a person skilled inthe art.

I claim:

1. Machine for manufacturing tubular bodies from plastic substancescomprising a palr of cooperatlng cylinders, each defining part of amould cavity, means for-rotating.

said cylinders so that said cavities combine into a complete mould,co-axial cores inserted in one of said cylinders and means forreciprocating said cores in opposite directions.

2. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating said cylinders so that said cavitiescombine into a complete mould, a core inserted in one.

'into a complete mould, a core inserted in one of said cylinders, astationary helical cam adapted to advance said core into said mould,-

said cam being partly recessed, and means for retracting said core fromsaid mould when it has been released by said recessed portion of saidcam.

4. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, eachdefining part of a mouldcavity, means for rotating said cylinders so that said cavities combineinto a complete mould, cores inserted in one of said cylinders,stationary helical cams adapt-.

ed to advance each core into said mould, one of said cams being ofgreater pitch than the other, and means for retracting saidcores fromsaid mould.

5. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating 'said cylinders so that said cavitiescombine into a complete mould, a core inserted in one of said cylinders,means for advancing said core into, and separate positive means for re-'tracting it from, said mould.

6. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of a.mould cavity, means for rotating said cylinders so that said cavitiescombine into a complete mould, a core inserted in one i of saidcylinders, means for advancing said core into, and positive andresilient means for retracting it from, said mould.

7. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating pair of cooperating cylinders, eachdefining part of a mould cavity, means for rotating said cylinders sothat said cavities combine into a complete mould, one of said cylindersdefining a groove in continuation of said mould, a core adapted to beadvanced and retracted in said groove and said mould, means forinserting a member in said groove, and means for advancing said memberinto said mould after said core has been retracted therefrorn 9. Machinefor" manufacturing tubular bodies from plastic substances comprising apair of cooperating cylinders, each defining part of a mould cavity,means for rotating said cylinders so that said cavities combine into acomplete mould, one of said cylinders defining a groove in continuationof said mould, a core adapted to be advanced and retracted in saidgroove and said mould, means for inserting a member in said groove,means for depressing said member into said groove, and means foradvancing said member into said mould after said core has been retractedtherefrom.

10. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating said cylinders so that said cavitiescombine into a complete mould, a disc arranged at one end of saidcylinders, said disc being of larger diameter than said cylinders, acore inserted in said disc where it projects beyond said eyl-.

inder, and means for advancing said core axially into and for retractingit axially from said mould.

11. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotat ng said cylinders so thatsaid cavit1escombine into a complete mold, a core inserted in one of said cylinders,means for advancing sa1d core axially into, and for retracting itaxially from, said mould, and a projection in one of said cavitiesadapted to cooperate with sa1d core so as to form ahole in said mouldedobject.

12. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating sa1d cylinders so that said cavitiescombine into a complete mould, a core inserted in one of said cylindersand bevelled at its inner end, means for advancing said core into, andfor retracting it from, said mould, and a projection in one of saidcavities adapted to cooperate with said core so as to form a hole insaid moulded object.

13. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating said cylinders so that said cavitiescombine into a complete mould, a core inserted in one of said cylindersand bevelled at its inner end, means for preventing rotation of saidcore, means for advancing said coreinto, and for retracting it from,said mould,'and a projection in one of said cavities adapted tocooperate with said core so as to form a hole in said moulded object.

14. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotating said cylinders so that said cavitiescombine into a complete mould, a core inserted in one of said cylindersand bevelled at its inner end, a head on the outer end of said core,said head being non-circular on part of its edge, a check on thecylinder in which said core is inserted, said check being adapted tocooperate with said non-circular portion so as to prevent rotation ofsaid core about its axis, means for advancing said core into, and forretracting it from, said mould, and a projection in one of said cavitiesadapted to 00- operate with said-core so as to form a hole in saidmoulded'object.

15. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part. of amould cavity, means for rotating said cylinders so that said cavitiescombine into a complete mould, a core inserted in one of said cylindersand bevelled at its inner end, a head on the outer end of said core,said head being non-circular on part of its edge, an angular flange onthe cylinder in which "said core is inserted, said angular flange beingadapted to cooperate with sa1d noncircular portion so as to preventrotation of said core about its axis, means for advancing said coreinto, and for retracting it from, said mould, and a projection in one ofsaid cavities adapted to cooperate with said core so as to form a holein said moulded object.

16. Machine for manufacturing tubular bodies from plastic substancescomprising a pair of cooperating cylinders, each defining part of amould cavity, means for rotatmg lar portion so as to prevent rotation ofsaid core about its axis, a stationary helical cam 1 arranged withinsaid angular flange and adapted to advance s'aid core into said mould,

and means for retracting said core from said mould.

. In testimony whereof I afiix my signature.

' ARTHUR HAN NS.

